Podcast
Questions and Answers
What type of physical connection is used when data is transmitted through a physical cable?
What type of physical connection is used when data is transmitted through a physical cable?
In a corporate office setup, what are employees' desktop or laptop computers connected to via cable?
In a corporate office setup, what are employees' desktop or laptop computers connected to via cable?
Which type of network connection utilizes radio waves for data transmission?
Which type of network connection utilizes radio waves for data transmission?
What must devices on a wireless network be connected to in order to offer wireless capability?
What must devices on a wireless network be connected to in order to offer wireless capability?
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Which layer of the network model involves identifying network devices and cabling?
Which layer of the network model involves identifying network devices and cabling?
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What is the main advantage of offering wireless connectivity for individuals and businesses?
What is the main advantage of offering wireless connectivity for individuals and businesses?
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What type of medium do WLANs operate in?
What type of medium do WLANs operate in?
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Which physical layer media are most popular for network deployments?
Which physical layer media are most popular for network deployments?
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What does a Wireless Access Point do?
What does a Wireless Access Point do?
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Which organization developed the Wi-Fi standard?
Which organization developed the Wi-Fi standard?
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What is a major component of wireless network administration?
What is a major component of wireless network administration?
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In what mode does a WLAN operate that leads to reduced bandwidth as more users access it simultaneously?
In what mode does a WLAN operate that leads to reduced bandwidth as more users access it simultaneously?
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What type of device combines switching with wireless access points in many home network implementations?
What type of device combines switching with wireless access points in many home network implementations?
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Which type of network interface card (NIC) is used for wired connections?
Which type of network interface card (NIC) is used for wired connections?
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What happens to the performance of a wireless device as it moves further away from a wireless access point?
What happens to the performance of a wireless device as it moves further away from a wireless access point?
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Why might a network printer only have an Ethernet NIC?
Why might a network printer only have an Ethernet NIC?
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What is an advantage of Integrated Service Routers (ISRs) in home networks?
What is an advantage of Integrated Service Routers (ISRs) in home networks?
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Which device would likely use WLAN NICs for network connectivity?
Which device would likely use WLAN NICs for network connectivity?
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Study Notes
Physical Layer Connection
- A physical connection to a local network must be established before any network communications can occur
- A physical connection can be a wired connection using a cable or a wireless connection using radio waves
- The type of physical connection used depends on the setup of the network
- Wired connections use physical cables to transmit data, whereas wireless connections use radio waves
Wired Connections
- Desktop or laptop computers are physically connected to a shared switch using cables in a corporate office setup
- Data is transmitted through a physical cable in a wired connection
Wireless Connections
- Many businesses offer wireless connections for laptops, tablets, and smartphones
- Devices on a wireless network must be connected to a wireless access point (AP)
- Wireless connectivity is popular due to the advantages of offering this type of service
- Network security is a major component of wireless network administration
- WLANs operate in half-duplex, meaning only one device can send or receive at a time
- The wireless medium is shared amongst all wireless users
- More users accessing the WLAN simultaneously results in less bandwidth for each user
Wireless Media
- IEEE and telecommunications industry standards cover wireless data communications for both the data link and physical layers
- Physical layer specifications apply to areas such as:
- Data to radio signal encoding
- Frequency and power of transmission
- Signal reception and decoding requirements
- Antenna design and construction
- Wi-Fi is a trademark of the Wi-Fi Alliance and is used with certified products that belong to WLAN devices based on the IEEE 802.11 standards
Wireless Access Point
- Concentrates wireless signals from users and connects to the existing copper-based network infrastructure, such as Ethernet
- Switch devices and wireless access points are often two separate dedicated devices within a network implementation
- Some devices offer both wired and wireless connectivity, such as home integrated service routers (ISRs)
Network Interface Cards
- Connect a device to the network
- Ethernet NICs are used for wired connections
- WLAN NICs are used for wireless connections
- An end-user device may include one or both types of NICs
- A network printer may only have an Ethernet NIC and must connect to the network using an Ethernet cable
- Other devices, such as tablets and smartphones, might only contain a WLAN NIC and must use a wireless connection
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Description
Test your knowledge on the functions of the physical layer, data link layer, network devices, cabling, and connecting wired and wireless LANs. Explore topics such as standards, protocols, and transmission of data across local media.
